CN106996813B - Method for operating a mass flow measuring device and mass flow measuring device - Google Patents
Method for operating a mass flow measuring device and mass flow measuring device Download PDFInfo
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- CN106996813B CN106996813B CN201710041443.9A CN201710041443A CN106996813B CN 106996813 B CN106996813 B CN 106996813B CN 201710041443 A CN201710041443 A CN 201710041443A CN 106996813 B CN106996813 B CN 106996813B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
- G01F1/8468—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits
- G01F1/849—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits vibrating measuring conduits having straight measuring conduits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8431—Coriolis or gyroscopic mass flowmeters constructional details electronic circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
- G01F1/78—Direct mass flowmeters
- G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
- G01F1/84—Coriolis or gyroscopic mass flowmeters
- G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
- G01F1/8436—Coriolis or gyroscopic mass flowmeters constructional details signal processing
Abstract
The invention relates to a Coriolis mass flow measuring device and to a method for operating a Coriolis mass flow measuring device, in particular a method for operating a Coriolis mass flow measuring device, having at least one actuator, at least one electrical servomechanism, at least one electromagnetic drive having a drive coil as a vibration generator, at least one measuring tube and at least one vibration sensor, wherein the actuator generates an actuator output signal for actuating the electrical servomechanism, the electrical servomechanism supplies an electrical excitation signal for exciting the electromagnetic drive, the electromagnetic drive excites the measuring tube to vibrate in at least one eigenmode and wherein the excited vibration of the measuring tube is detected by the vibration sensor and is output as at least one output signal, wherein the electrical servomechanism loads the drive coil of the electromagnetic drive with a drive voltage and a drive current, so that the vibrations of the measuring tube occur to a maximum extent at resonance.
Description
Technical Field
The invention relates to a method for operating a Coriolis mass flow measuring device having at least one actuator, at least one electric servomechanism, at least one electromagnetic drive having a drive coil as a vibration generator, at least one measuring tube and at least one vibration sensor, wherein the actuator generates an actuator output signal for actuating the electric servomechanism, wherein the electric servomechanism supplies an electric excitation signal for exciting the electromagnetic drive, which excites the measuring tube to vibrate in at least one eigenmode, and wherein the excited vibration of the measuring tube is detected by the vibration sensor and output as at least one output signal, wherein the electric servomechanism loads the drive coil of the electromagnetic drive with a drive voltage and a drive current, so that the vibrations of the measuring tube occur to a maximum extent at resonance. The invention further relates to a coriolis mass flow measuring device which carries out such a method during operation.
Background
The aforementioned method for operating a coriolis mass flow measuring instrument and a corresponding coriolis mass flow measuring instrument have been known since many years, for example from DE 102012011932 a 1. They generally belong to the class of resonance measuring systems to which fill level monitors or densitometers according to the tuning fork principle, quartz scales and strip viscometers (bandviskosmeters) also belong. The resonance measurement system is in communication with a process, wherein the process and the resonance measurement system interact. For such systems, the information about the process variables (measured variables) to be determined is encrypted in terms of eigenfrequencies. In such systems, the operating point is usually set at the eigenfrequency of the measurement system. In a coriolis mass flow measuring instrument, the measuring tube corresponds to a vibrating element of the resonance measuring system.
Resonant measurement systems designed as coriolis mass flow measuring devices are used in particular in industrial process measurement technology where the mass flow must be determined with high accuracy. The functional mode of the coriolis mass flow measuring instrument is based on the fact that at least one measuring tube (the vibration element) through which a medium flows is excited to vibration by a vibration generator, wherein the vibration generator is an electromagnetic drive, which has a drive coil, as the case may be. The coil is usually flowed through by an electric current, wherein the force acting on the vibrating element, i.e. on the measuring tube, is directly linked to the coil current; the force action is mostly achieved and caused by a permanent magnet mounted movably in the driver coil.
In a coriolis mass flow measuring device, the functional mode is based on the fact that the mass-containing medium acts on the wall of the measuring tube on the basis of coriolis inertial forces caused by two orthogonal movements (the movement of the flow and the movement of the measuring tube). This reaction of the medium on the measuring tube leads to a change in the vibration state of the measuring tube compared to the vibration state of the measuring tube which does not flow through. By detecting this characteristic of the vibrations of the coriolis measuring tube flowing through, the mass flow through the measuring tube can be determined with high accuracy.
Of particular importance is the eigenfrequency of the coriolis mass flow measuring device (essentially the eigenfrequency of the measuring tube as the vibrating element), since the operating point of the coriolis mass flow measuring device is usually set to the eigenfrequency of the measuring tube, in order to be able to induce the coriolis force with a minimum of energy expenditure plus the required vibrations. This is indicated when it is stated that the vibrations of the measuring tube occur to a maximum extent at resonance. The vibrations, which are carried out by the measuring tube, have a defined form, which is referred to as the eigenform of the respective excitation.
It is known from the prior art that, for the purpose of exciting the vibration element, a harmonic fundamental signal is generated by the regulator in the form of a sinusoidal voltage as a regulator output signal and this sinusoidal voltage actuates the electric servomechanism and thus the drive coil, wherein the electric servomechanism has the task of providing a corresponding power at its output in order to be able to actuate the electromagnetic drive in a suitable manner and with sufficient power. The electrical servomechanism is thus in fact a power connection between the electromagnetic drive of the coriolis mass flow measuring device and the actuator.
The regulator is used for a measuring tube which is operated as a vibrating element in resonance, for which purpose it must be determined whether the input and output of the coriolis mass flow measuring instrument or of the measuring tube have a phase difference corresponding to the resonance. In the coriolis mass flow measuring instrument, this is the force on the input side for exciting the measuring tube as a vibrating element, and this is the temporal change in the speed of the measuring tube, i.e., the deflection of the measuring tube, on the output side. If the force action on the input side and the measuring tube velocity on the output side have a phase difference of 0 °, then, due to the relationships on which such a system capable of oscillation is based, there is a resonance in the eigenform of the movement. If such phase conditions are met, the desired resonance exists. For this reason, the regulator is arranged in a regulating circuit which is designed overall (anyway) as a phase regulating circuit.
In the prior art, coriolis mass flow measuring devices usually have either a mechanism for applying a voltage or a device for applying a current to an electromagnetic drive having a drive coil as an electrical servo mechanism. Electric current addingUp to the electromagnetic drive with a coil, a high and noisy (verauschten) voltage is inevitably induced at the drive coil, since the jump in the regulator output signal (and this jump is also caused only by the quantization step of the digital/analog converter) occurs as a jump in the current through the electromagnetic drive and is differentiated there by the drive coil; this applies in particular to electric servos with high slew rates, that is to say with high current rise rates. This is problematic with regard to the electromagnetic compatibility and also leads to a reduction in the signal-to-noise ratio and thus to an increase in the measurement uncertainty when measuring different process variables and when determining different parameters of the resonant measurement system (i.e., in the case of the present coriolis mass flow measuring instrument, for example, the stiffness of the measuring tube). Some of the known methods require a parameter of the driver coil in order to implement the phase controller, that is to say for example the inductance L of the coilSAnd ohmic resistance RSAccurate understanding of.
Disclosure of Invention
The object of the present invention is to provide a method for operating a coriolis mass flow measuring instrument, which allows a resonance point as an operating point of the coriolis mass flow measuring instrument to be easily, quickly and reliably steered, held and tracked.
The method according to the invention for operating a coriolis mass flow measuring instrument (the previously described and illustrated object of which is solved) is firstly and essentially characterized in that, in order to achieve the resonant operation, the output signal of the vibration sensor is ascertained, the drive voltage at the drive coil is ascertained, the phase of the drive current relative to the phase of the output signal of the vibration sensor is ascertained, and a new desired phase for the drive voltage is ascertained from the ascertained quantities and is fed to the controller in such a way that the controller generates the drive voltage with the ascertained new desired phase by means of the electrical servo.
The proposed method is very advantageous because it uses a quantity that can be determined very easily in terms of measurement technology, such as, for example, the output signal of the vibration sensor (which can be assumed to be known since it is indeed always necessary for determining the mass flow) or also the driver voltage at the driver coil, which is known per se since it is generated by the regulator output signal (but which can also be detected very easily in terms of measurement technology). The driver current through the driver coil can likewise be determined easily, for example, by means of a very small measuring resistance, wherein the voltage dropping at the measuring resistance is tapped off as a measuring signal.
The transfer characteristic of the coriolis mass flow measuring device is described in the control-technical sense, as in all physical systems, by the ratio of the output variable to the input variable which leads to the output variable. In the case of the coriolis mass flow measuring device, this is, on the one hand, the force acting on the measuring tube by the electromagnetic drive and, on the other hand, the deflection speed of the measuring tube at the measurement point. In resonance, there is no distinction between the course of the force loading and the course of the speed of the measuring tube (i.e. the first derivative of the deflection of the measuring tube over time).
The force exerted in an electromagnetic drive with a drive coil is proportional to the current through the drive coil, which is used to detect the drive current i through the drive coildrThis is the reason. The detection of the deflection of the measuring tube is usually carried out by a vibration sensor which operates with a measuring coil and a permanent magnet moving therein, which is deflected by the measuring tube and induces a voltage in the measuring coil. The measuring tube speed, that is to say the first derivative of the measuring tube deflection, appears to be proportional to the voltage induced in such a vibration sensor. In this connection it can be understood why the output signal of the vibration sensor is detectedu SAre also significant.
If these quantities are present, this can be achieved without problems, and the output signal for the vibration sensor is also determinedu SPhase phi ofSOf the driver current idrPhase phi ofidrif the phase is known, the phase between the exciting force F to the measuring tube and the reaction mass of the measuring tube velocity (Reaktionsgröbeta ö) is also known, which is of practical interest ö
In an advantageous embodiment of the proposed method, it is provided that the desired setting for the drive voltage and thus also the desired phase of the drive voltage are determined while defining a zero phase of the output signal of the vibration sensor. The information that is relevant for the regulation is the phase difference between the output signal of the vibration sensor and the phase of the driver current and is not very much the absolute magnitude of the driver voltage or the absolute magnitude of the driver current. That is to say if: if a desired preset, that is to say a complete desired preset with a quantity and phase, is calculated for the driver voltage that can be influenced and determined by the regulator in order to execute the measuring tube oscillation with resonance, then this desired phase of the driver voltage is also automatically determined in order to generate resonance.
For determining the phase difference or for giving the desired phase simplification, a zero phase is defined as the output signal of the vibration sensor being preset, i.e. the phase of the output signal is automatically set to zero, i.e. all other vibration quantities are based on the phase of the output signal.
In a preferred embodiment of the previously described development of the method according to the invention for operating a coriolis mass flow measuring instrument, provision is made for the driver voltage to be applied to the driveru drIs preset tou dr,sollThe relationship is obtained by the following equation:
to this end, k can be implementedBThe mutual inductance is a purely real number. It is absolutely intentional here that the output signal of the vibration sensoru SThe real quantity, that is to say the non-underlined quantity, is referred to, since all other quantities are based on the output signalu SIs defined as the phase of zero. Desired phase of the electromagnetic driveu dr,sollAnd an electrical excitation signalu drIn the usual case, the amount of phase shift is referred to, i.e. relative to the output signal of the vibration sensoru SWith a phase shift, whereby the quantities are here also generally underlined. The relationship is also discussed within the scope of the graph description.
It has proven advantageous if the impedance of the driver coilZ SOutside of the resonant operation, the result is obtained from the driver voltageu drAnd the driver current that appearsi drTo calculate a quotient, and the mutual inductance kBNeglecting the mutual induction voltage at the driver coilu BIn this case, a grid equation of the line grid (Netzwerkmasche) is used. The line network is formed by the output of the electric servomechanism and an electromagnetic drive having a drive coil, which is coupled to the electric servomechanism. If the impedance of the driver coilZ SThis is particularly simple to determine in order to determine the mutual inductance kBTo take into account the impedance with the driver coilZ SThe driver currenti drAnd an output signal of the vibration sensoru SThe following relationships:
of course, for the driver voltage udrIs preset tou dr,sollThe determination of (c) is performed continuously, as is usual for conventional scanning systems with actuators. This ensures that the changed resonance point is always reacted to and tracked even in the event of a change in the set conditions determined during operation of the coriolis mass flow measuring device.
However, it may also be advantageous if the control operation is temporarily interrupted in resonance, the control device being provided with a preset output signal for the vibration sensoru SPhase phi ofSOf the driver currenti drPhase phi ofidrOther phases of (a) are preset. Such settings that differ from normal operating operation can be used, for example, for system identification, for example, in order to determine, phase-selectively, parameters, for example, parameters of a mathematical model of the coriolis mass flow measuring instrument, which are used for regulation.
The object according to the invention is further achieved by a coriolis mass flow meter (which performs the above-described method in its various embodiments), that is to say by a coriolis mass flow meter having at least one actuator, at least one electrical servomechanism, at least one electromagnetic drive having a drive coil as a vibration generator, at least one measuring tube and at least one vibration sensor, wherein the actuator generates an actuator output signal for actuating the electrical servomechanism, wherein the electrical servomechanism supplies an electrical excitation signal for exciting the electromagnetic drive, wherein the electromagnetic drive excites the measuring tube to vibrate in at least one eigenmode, and wherein the excited vibrations of the measuring tube are detected by the vibration sensor and output as at least one output signal, the electric servomechanism applies a drive voltage and a drive current to the drive coil of the electromagnetic drive in such a way that the vibrations of the measuring tube occur to the greatest extent at resonance. The coriolis mass flow measuring device for solving the object is characterized in that, in order to achieve the resonant operation, an output signal of the vibration sensor is determined, a drive voltage at the drive coil is determined, a phase of the drive current is determined relative to the phase of the output signal of the vibration sensor, and a new desired phase for the drive voltage is determined from the determined quantity and is fed to the controller in such a way that the controller generates a drive voltage having the determined new desired phase by means of the electrical servo.
A particularly advantageous embodiment of the coriolis mass flow measuring instrument is characterized in that the coriolis mass flow measuring instrument, in operation, implements one of the methods described above with its particular embodiment.
Drawings
In detail, various possibilities exist for designing and improving the method according to the invention for operating a coriolis mass flow measuring instrument and the coriolis mass flow measuring instrument according to the invention. Reference is made to the description of the preferred embodiments taken in conjunction with the accompanying drawings. In the attached drawings
Fig. 1 schematically shows the structure of a coriolis mass flow measuring instrument, as is known from the prior art, but as it can also be used for the method according to the invention and the coriolis mass flow measuring instrument according to the invention,
FIG. 2 shows an equivalent circuit diagram of a coil contained in an electronic drive, together with an electric servo, an
Fig. 3 shows a method according to the invention for operating a resonance measurement system in a block diagram representation.
Detailed Description
Fig. 1 shows a coriolis mass flow measuring instrument 1 having: the actuator 2, the electric servomechanism 3 and the electromagnetic drive 4 with the drive coil not shown in detail in fig. 1 are implemented as a vibration generator in the form of a digital signal processor.
The coriolis mass flow measuring device 1 has a measuring tube 5. The electromagnetic drive 4 has the task of exciting the measuring tube 5, which can flow through it as a medium, to vibrate in a eigenmode. Depending on the type of the eigenforms, only a single electromagnetic drive 4 is required for this purpose, but two or more electromagnetic drives 4 are also required if higher modes should also be able to be excited.
In fig. 1, the coriolis mass flow measuring instrument 1 is shown in two halves. The coriolis mass flow measuring device 1 forming a unit ends on the half at the right-hand edge of the figure and for reasons of a clear illustration begins again with the other half at the left-hand edge of the figure. It can be seen here that the coriolis mass flow measuring device 1 furthermore has vibration sensors 6, which each output a respective output signal in the form of a current speed signalu SThe velocity signal gives information about the velocity v of the movement of the measuring tube. The electrical state variables are underlined here to clarify that this generally relates to harmonic signals with a phase, that is to say can be described as vectors. It is thereby possible to conclude that the electrical state variable, which is not underlined, has (for any reason) the phase zero, i.e. is mathematically real.
The regulator 2 generates a regulator output signalu CFor actuating the electric servomechanism 3, and the electric servomechanism 3 subsequently generates an electrical excitation signalu drFor exciting the electromagnetic driver 4. Coupled to the vibration sensor 6 are a plurality of transmission elements 7, which are essentially used for signal processing, such as, for example, a matching electronics (anpasungselektronik) 7a, which is formed by an amplifier, a hardware multiplexer 7b for implementing different switchable measurement channels, a further matching electronics 7c and an analog/digital converter 7d, which supplies the analog measured signal in the form of a digital signal back to the controller 2. The exact embodiment of the transmission element is not relied upon in the context of the present invention, and the transmission element is described herein for completeness only.
In the prior art, the regulating circuit thus realizedForming a phase regulating loop and based on or on currenti drIs applied to the coil 8 of the electromagnetic drive 4 or is based on applying an electrical drive signal to a drive voltageu drIs connected to the end of the coil 8 of the electromagnetic drive 4. This design is shown in fig. 2 for purposes of explanation. The electromagnetic drive 4 has a drive coil 8, which has a coil inductance L in the equivalent circuit diagram according to fig. 2SOhmic coil resistance RSSpeed proportional inductive voltage sourceu B. The regulator not shown in fig. 2 provides the regulator output signalu CFor actuating the further electric servomechanism 3, which is formed by a controllable energy source 9 and a D/a converter. The controllable energy source 9 is either a voltage-controlled current source or a voltage source, wherein both solutions have different advantages and disadvantages, which are associated with particular characteristics of the coil 8, such as a sudden current change leading to a strongly changing terminal voltage.
For the electromagnetic drive 4 (which, as shown in fig. 2, has a coil 8), the coil current flowsi drIs particularly important because of the coil currenti drA state variable of the electromagnetic drive 4 is proportional to the force of the electromagnetic drive 4 acting on the measuring tube 5. In the case of the coriolis mass flow measuring device 1, the phase difference between the force F acting on the measuring tube 5 and the detected speed v of the measuring tube movement in the case of resonance and thus the coil currenti drAnd the detected velocity v of the measurement tube movement is also equal to zero. The speed v of the measuring tube movement corresponds here to the detected output voltage of the vibration sensor 6u SOr the output voltage detected by the vibration sensor 6u SAnd (4) in proportion. However, the movement of the measuring tube 5 does not only influence the vibration sensor 6, but rather also acts in reverse on a vibration generator in the form of the driver coil 8, since the movement of the measuring tube 5 is caused at this pointThe corresponding movement of the permanent magnet normally present in the driver coil 8, which movement itself generates the mutual induction voltageu B。
It therefore applies in the grid formed by the output terminals of the electric servomechanism 3 and the terminals of the coil 8 coupled thereto:
the challenge when operating the coriolis mass flow meter 1 is that the electric servomechanism 3 is actuated by the actuator 2 in such a way that the drive coil 8 of the electromagnetic drive 4 is acted upon by a drive voltageu drAnd driver currenti drSo that the vibrations of the measuring tube 5 occur to the greatest extent at resonance. In this context, "resonance at maximum" is considered to be a strictly defined, precise state of the system, which in a mathematical sense is never completely precisely encountered in practice, but is always precisely as the technical solution and the adjustments carried out actually permit, that is to say this simply means a resonant operation with the accuracy permitted by the technical solution carried out.
Fig. 3 shows a method according to the invention for operating the coriolis mass flow measuring device 1, i.e., in the form of a block diagram. The regulator 2 outputs a signal via the regulatoru CTo operate the electric servomechanism 3, wherein the electric servomechanism 3 outputs the electric excitation signalu drTo actuate the electromagnetic drive 4, which itself acts as a vibration generator to deflect the measuring tube 5. The electromagnetic drive 4 is formed by a schematically illustrated coil 8 with a permanent magnet as a core, wherein the permanent magnet, not illustrated, when the coil 8 is energized, effects a movement and thus can excite the measuring tube 5 to vibrate. The vibrations of the measuring tube 5 are detected by the vibration sensor 6, which is presentIn the former case, there are also permanent magnets and coils 11, wherein the voltage induced in the coils 11 is taken into account for the evaluation of the change in position of the measuring tube 5u S. That is to say as an output signal of the vibration sensor 6u SAre present.
According to the invention, provision is made here for the output signal of the vibration sensor to be determined in order to realize the resonant operationu SDetermining the driver voltage at the driver coil 8u drDetermining an output signal for the vibration sensor 6u SPhase phi ofSOf the driver currenti drPhase phi of i drAnd determining the driver voltage from the determined quantityu drNew desired phase phidr,sollAnd this is fed to the actuator 2, so that the actuator 2 generates a signal with the determined new desired phase phi by means of the electrical servo 3dr,sollDriver voltage ofu dr。
The method is based on the consideration that the phase difference between the force F acting on the measuring tube and the resulting measuring tube velocity v is to be set as zero as possible, wherein the phase difference also corresponds to the coil currenti drAnd the measuring tube velocity v or the induced counter voltageu BA phase difference therebetween. This also corresponds to the coil currenti drAnd the output signal of the vibration sensor 6u SThat is to say:
that is to say an electrical excitation signal for exciting the electromagnetic driveu drIt must be chosen so that the resonance conditions mentioned before are met. The following applies here: the mutual induction voltageu BAnd the output voltage of the vibration sensor 6u SAre in Phase (in Phase), and thus apply:
under this condition, the grid equation 1 can also be written as:
if the output signal isu SIs defined as the zero phase, i.e. phiS=0, recording and calculation become particularly simple. Equation 4 can therefore be written in this way, in a simplified manner, as follows:
since this also applies in the resonance case: the driver currenti drPhase phi of i drEqual to zero, i.e. preset for the driver voltage at the correct choiceu drIs preset tou dr,sollThe following applies:
whereby the current for the driver is determined after solving the previously introduced grid equation in the actual state and in the desired statei drThe method is applicable to the following steps:
if the actual state and the desired state are scaled in terms of equations, then we get:
thereby for the driver voltageu drIs preset tou dr,sollThe method is applicable to the following steps:
that is to say, it is appropriate for the driver voltage to be appliedu drIs preset tou dr,sollRe-determined according to the equation above. If this is done continuously (as is usual for scanning systems in the field of control technology), the coriolis mass flow measuring instrument 1 can remain in the resonant operation even when the resonance point drifts (for whatever reason) during the operation.
The illustrated relationship is premised on the mutual inductance kBAre known. The mutual inductance can be determined relatively simply according to an advantageous development of the method according to the invention. For this purpose, the impedance of the driver coil 8 is setZ SOutside of the resonant operation of the coriolis mass flow measuring device 1, this is achieved by calculating the drive voltageu drAnd the driver current that appearsi drQuotient of the components and neglecting the mutual induction voltage at the driver coil 8u B(allowed in this case) determining the mutual inductance kB. The determination is performed by means of a grid equation for the line grid formed by the output of the electric servomechanism 3 and the electromagnetic drive 4 with the drive coil 8. If the measuring tube 5 is excited to vibrate outside the resonance, the mutual induction voltage can be ignoredu BThe impedance can thus be calculated very simply from the grid equation:
however if the impedance isZ SIs known, then the mutual inductance kBCan be easily calculated by:
the method described is implemented for the coriolis mass flow measuring device 1 in the controller 2, so that the coriolis mass flow measuring device 1 shown here performs the described variant of the method for operating a coriolis mass flow measuring device in the operating mode.
Claims (9)
1. Method for operating a coriolis mass flow measuring device (1) having at least one actuator (2), at least one electric servo (3), at least one electromagnetic drive (4) having a drive coil (8) as a vibration generator, at least one measuring tube (5) and at least one vibration sensor (6), wherein the actuator (2) generates an actuator output signal: (1)u C) For actuating the electric servomechanism (3), the electric servomechanism (3) providing an electrical excitation signalu drA drive (4) for exciting the electromagnetism, wherein the drive (4) excites the measuring tube (5) to vibrate in at least one eigenmode, and wherein the excited vibration of the measuring tube (5) is detected by the vibration sensor (6) and is used as at least one output signalu STo output, wherein the electric servo (3) applies a drive voltage to a drive coil (8) of the electromagnetic drive (4) in the following manneru drAnd driver currenti drSo that the vibrations of the measuring tube (5) occur to the greatest extent at resonance,
it is characterized in that the preparation method is characterized in that,
for resonant operation, the output signal of the vibration sensor (6) is determinedu SDetermining the driver voltage at the driver coil (8)u drDetermining the relative vibration sensor (6)) Output signal ofu SPhase phi ofSOf the driver currenti drPhase phi ofidrAnd determining the driver voltage from the determined quantityu drNew desired phase (phi)dr,soll) And the new desired phase is introduced into the controller (2) in such a way that the controller (2) generates a new desired phase (phi) with the determined value by means of the electric servo (3)dr,soll) Driver voltage ofu dr。
2. The method of operating a coriolis mass flow measurement instrument of claim 1 where said output signal is definedu SZero phase ofSDetermining the driver voltage for the case of =0u drIs preset tou dr,sollAnd thereby also the driver voltageu drDesired phase (phi)dr,soll）。
3. Method for operating a coriolis mass flow measuring instrument (1) according to claim 2, characterized in that the relation for the drive voltage is determined by an equationu drIs preset tou dr,soll
Wherein k isBIs the mutual inductance and is real.
4. Method for operating a coriolis mass flow measuring instrument (1) according to claim 3, characterized in that the impedance of the driver coil (8)Z SOutside of the resonant operation, this is determined by the driver voltageu drAnd the driver current that appearsi drTo calculate a quotient, and the mutual inductance kBNeglecting the mutual induction voltage at the driver coil (8)u BIn the case of (2), the grid equation for the line grid formed by the output of the electric servomechanism (3) and the electromagnetic drive (4) having the drive coil (8) is determined.
5. Method for operating a coriolis mass flow measuring instrument (1) according to claim 4, characterized in that for determining the mutual inductance kBUsing the following impedance with the driver coilZ SThe driver currenti drAnd an output signal of the vibration sensoru SThe relationship of (1):
6. method for operating a coriolis mass flow measuring instrument (1) according to one of the claims 1 to 5, characterized in that the regulation operation is temporarily interrupted in resonance, the regulator (2) being preset and used for the output signal relative to the vibration sensor (6)u SPhase phi ofSOf the driver currenti drPhase phi ofidrDifferent phase presets for the desired value of (c).
7. The method for operating a coriolis mass flow measuring instrument (1) according to claim 6, characterized in that said phase presets are phases corresponding to a phase difference of + -45 °.
8. Coriolis mass flow measuring device (1) having at least one actuator (2), at least one electrical servo mechanism (3), at least one electromagnetic drive (4) having a drive coil (8) as a vibration generator, at least one measuring tube (5) and at least one vibration sensor (6), wherein the actuator (2) generates an actuator output signal (C:)u C) For actuating the electric servomechanism (3), the electric servomechanism (3) providing an electrical excitation signalu drA drive (4) for exciting the electromagnetism, wherein the drive (4) excites the measuring tube (5) to vibrate in at least one eigenmode, and wherein the excited vibration of the measuring tube (5) is detected by the vibration sensor (6) and is used as at least one output signalu STo output, wherein the electric servo (3) applies a drive voltage to a drive coil (8) of the electromagnetic drive (4) in the following manneru drAnd driver currenti drSo that the vibrations of the measuring tube (5) occur to the greatest extent at resonance,
it is characterized in that the preparation method is characterized in that,
for resonant operation, the output signal of the vibration sensor (6) is determinedu SDetermining the driver voltage at the driver coil (8)u drDetermining an output signal for the vibration sensor (6)u SPhase phi ofSOf the driver currenti drPhase phi ofidrAnd determining the driver voltage from the determined quantityu drNew desired phase (phi)dr,soll) And the new desired phase is introduced into the controller (2) in such a way that the controller (2) generates a new desired phase (phi) with the determined value by means of the electric servo (3)dr,soll) Driver voltage ofu dr。
9. The coriolis mass flow measuring instrument (1) according to claim 8, characterized in that it is designed such that it performs one of the methods according to one of claims 2 to 7 during operation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016100952.0 | 2016-01-20 | ||
| DE102016100952.0A DE102016100952A1 (en) | 2016-01-20 | 2016-01-20 | A method of operating a Coriolis mass flowmeter and Coriolis mass flowmeter |
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| Publication Number | Publication Date |
|---|---|
| CN106996813A CN106996813A (en) | 2017-08-01 |
| CN106996813B true CN106996813B (en) | 2020-05-19 |
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| CN201710041443.9A Active CN106996813B (en) | 2016-01-20 | 2017-01-20 | Method for operating a mass flow measuring device and mass flow measuring device |
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| Country | Link |
|---|---|
| US (1) | US10378942B2 (en) |
| EP (1) | EP3196605B1 (en) |
| CN (1) | CN106996813B (en) |
| DE (1) | DE102016100952A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10429224B2 (en) | 2017-12-05 | 2019-10-01 | General Electric Company | Interface for a Coriolis flow sensing assembly |
| US10422678B2 (en) | 2017-12-05 | 2019-09-24 | General Electric Company | Coriolis flow sensor assembly |
| DE102018123534A1 (en) | 2018-09-25 | 2020-03-26 | Krohne Messtechnik Gmbh | Method for determining the gas content in the medium flowing through a Coriolis mass flow meter |
| CN109855706B (en) * | 2018-12-20 | 2024-03-29 | 山东省科学院海洋仪器仪表研究所 | Negative pressure pneumatic conveying experimental device and experimental method |
| DE102022129037A1 (en) | 2022-11-03 | 2024-05-08 | Krohne Messtechnik Gmbh | Procedure for testing a Coriolis mass flow meter |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8712331U1 (en) * | 1986-09-26 | 1988-01-28 | Flowtec Ag, Reinach, Basel, Ch | |
| JPH02503359A (en) | 1988-05-11 | 1990-10-11 | エンドレス ウント ハウザー フローテック アクチエンゲゼルシヤフト | Mass flowmeter operating on the Coriolis principle |
| US6092409A (en) * | 1998-01-29 | 2000-07-25 | Micro Motion, Inc. | System for validating calibration of a coriolis flowmeter |
| AU2006338578B2 (en) * | 2006-02-27 | 2011-10-13 | Micro Motion, Inc. | Flow meter and method for detecting a cable fault in a cabling of the flow meter |
| DE102006017676B3 (en) * | 2006-04-12 | 2007-09-27 | Krohne Meßtechnik GmbH & Co KG | Coriolis-mass flow rate measuring device operating method, involves utilizing indicator parameter and additional indicator parameter for detection of multiphase flow, where additional parameter is independent of indicator parameter |
| DE102006031198B4 (en) * | 2006-07-04 | 2012-01-26 | Krohne Ag | Method of operating a Coriolis mass flowmeter |
| DE102008046891B4 (en) | 2008-07-08 | 2014-10-30 | Abb Technology Ag | Measuring device of the vibration type |
| DE102008059920B4 (en) * | 2008-12-02 | 2016-07-14 | Krohne Meßtechnik GmbH & Co KG | Method for operating a resonance measuring system and related resonance measuring system |
| CN104541136B (en) | 2012-06-18 | 2018-07-27 | 克洛纳测量技术有限公司 | Method for operating resonance measurement system |
| DE102012011934B4 (en) | 2012-06-18 | 2014-07-10 | Krohne Messtechnik Gmbh | Method for operating a resonance measuring system and related resonance measuring system |
| DE102012011932B4 (en) | 2012-06-18 | 2016-09-15 | Krohne Messtechnik Gmbh | Method for operating a resonance measuring system and related resonance measuring system |
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- 2016-01-20 DE DE102016100952.0A patent/DE102016100952A1/en not_active Withdrawn
- 2016-12-15 EP EP16204316.0A patent/EP3196605B1/en active Active
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| US20170205263A1 (en) | 2017-07-20 |
| US10378942B2 (en) | 2019-08-13 |
| CN106996813A (en) | 2017-08-01 |
| DE102016100952A1 (en) | 2017-07-20 |
| EP3196605A1 (en) | 2017-07-26 |
| EP3196605B1 (en) | 2021-01-27 |
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